I just got the game for DS - I've played it once so far and let me say it is AMAZING! I didn't know it would have the sort of 360 degree view, that was a real surprise. Fish Tycoon was already a good game and they made it even more enjoyable. I'm this impressed and only just began playing it. And my chief (or maybe only) complaint in the PC/Mac version was the music that played in the store while you are selling but on the DS version, the store part is really, really cool.
I have come across a fish I never saw on the original game & I dont even know what to do with it! It's a Clown Trigger. I'm afraid to mess with it!